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Warren County, Pennsylvania

A shallow water table limits basements on 67% of Warren County's mapped land, a higher share than 80% of US counties and the 7th highest of 67 Pennsylvania counties. Shrink-swell clay limits houses without basements on 0%.

None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 9 flood losses here since 2016. 76% of homes were built before 1980, against 50% nationally; the median home dates from 1959.

Data as of October 13, 2026 · sources

0%

expansive clay: shrink-swell limits slab homes

67%

high water table: limits basements

0%

in drought, October 13, 2026

76%

of homes built before 1980

Soil under Warren County

Expansive clay (limits slab homes)0.0%
High water table (limits basements)67.2%
Septic fields very limited97.7%
Clay swell (LEP, by area)1.9%
High-swell land (LEP 6%+)0.0%
Mapped soil574,539 acres
Soil seriesShare hereSeries nationally: high water table
Hazleton16%0%
Venango9%n/a
Cookport8%n/a
Alvira8%n/a
Hanover7%n/a
Gilpin7%under 1%
Forest County: 59%Chautauqua County: 75%McKean County: 54%Venango County: 73%Crawford County: 85%Cattaraugus County: 65%Elk County: 52%Clarion County: 50%Warren County ForestChautauquaMcKeanVenangoCrawfordCattaraugusElkClarionWarren
Warren County (heavy outline) and nearby counties, shaded by high water table share.under 10%10-25%25-40%40-60%60%+

How we count · survey areas PA609 (2025-09-05)

What the numbers mean here

On 67% of Warren County's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.

Rain over the 12 months to August 2026: 46.37 in, 0.09 in below the 1991-2020 average year of 46.46 in.

USDA rates 98% of the land very limited for septic absorption fields.

Drought

0% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 12 of the last 52 weeks; the most was 100% of its area, on the October 21, 2025 map.

October 21, 2025Share of area in drought, weeklyOctober 13, 2026
Category, October 13, 2026Share of county
D0 abnormally dry or worse9.5%
D1 moderate drought or worse0%
D2 severe or worse0%
D3 extreme or worse0%
D4 exceptional0%

Flood losses since 2016

9 flood losses since 2016, $81,550 paid. The worst year was 2017, with 3.

YearFlood losses
20160
20173
20181
20192
20200
20210
20222
20231
20240
20250
2026 to date0

Rain

Average year, 1991-202046.46 in
12 months to August 202646.37 in (-0.09)
202542.81 in (-3.65)
Wettest year since 18951990: 56.34 in
Driest year since 18951941: 31.79 in
Days with 1 inch or more, normal at WARREN (8 mi away)7.9

Homes

Housing units21,629
Median year built1959
Built before 198076%
Built 2000 or later8%
Owner-occupied80%
Median value, owner-occupied$127,500
Single-family detached78%

What repairs cost

Published ranges from cost guides, not quotes. More sources, and where they disagree.

WorkRangeSource
Basement waterproofing, US $3,000 to $10,000 Fixr, February 6, 2026
Sump pump installation, US $800 to $2,000 Fixr, January 31, 2025
Crawl space encapsulation, US $2,000 to $8,000 Fixr, August 29, 2025

Nearby counties

PlaceDistanceExpansive clayHigh water table
Forest County, PA 22 mi 0% 59%
Chautauqua County, NY 33 mi 0% 75%
McKean County, PA 37 mi 0% 54%
Venango County, PA 38 mi under 1% 73%
Crawford County, PA 43 mi 0% 85%
Cattaraugus County, NY 43 mi 0% 65%
Elk County, PA 44 mi 0% 52%
Clarion County, PA 44 mi under 1% 50%

Sources: USDA SSURGO (September 5, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status